5/16th to 5mm Coupler

Just a odd coupler size that I couldn't find so I decided to create and share. This is actually a drive coupler for a linear rail design I will be uploading soon, enjoy!

UPDATE 2-20-16: I shrunk both the holes by .5mm as I found it not quite gripping all the way. I also add .5mm to the cut out section between the fasteners to give it a bit more room to tighten down. -pb